He knows it is high time that he ________ at once.
The coach asked his staff to the large group of journalists, waiting for him to announce his training plan.
The human race has already paid a heavy price for its slow to environment threats.
Mary and I see each other ____, but not as often as we used to.
China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boatsfrom ______in the South China Sea.
Tom was for you to come to his birthday party.